US3413233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical brighteners for synthetic organic material and process
Assignee: BASF Schweiz AG
•
Filing: 1965-08-16
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Granted: 1968-11-26
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Expires: 1985-08-16
Abstract
No abstract record available.
Inventors
- 👤 Siegrist Adolf Emil
- 👤 Maeder Erwin
- 👤 Guglielmetti Leonardo
- 👤 Liechti Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:59
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A PROCESS FOR THE OPTICAL BRIGHTENING OF SYNTHETIC ORGANIC MATERIALS WHICH COMPRISES APPLYING TO SAID MATERIALS STILBENE DERIVATIVES OF THE FORMULA
Claim 2
Dependent Claim
21 words
A PROCESS FOR THE OPTICAL BRIGHTENING OF SYNTHETIC ORGANIC MATERIALS WHICH COMPRISES APPLYING TO SAID MATERIALS STILBENE DERIVATIVES OF THE FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-26 | 1972-05-27 | 1972-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-26 | 1976-05-27 | 1976-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-26 | 1980-05-27 | 1980-11-26 | $7700.00 | Window Closed / Lapsed |